Belden Magnum RS485 Fiber Optic Link Installation & User Guide

Brand: Belden

Model: Magnum RS485 Fiber Optic Link

Type: Installation & User Guide

This manual is also suitable for

DYMEC Industrial Fiber Optic Link-Repeater

Industrial Fiber Optic

Link/Repeaters

Models 5845HRT and 5846HRT

Models 5845SHRT and 5846SHRT

User Manual

Document #3-44-0004-00

REV AD

25 Commerce Way North Andover, MA 01845

(978) 688-8807 • FAX (978) 688-8771

$5.00 USD

www.garrettcom.com

Printed in USA

This page is left blank intentionally.

Warnings, Cautions, and Notes

as Used in this Publication

WARNING

Warning notices are used in this publication to emphasize that hazardous voltages, currents, or

other conditions that could cause personal injury exist in this equipment or may be associated with

its use.

In situations where inattention could cause either injury or damage to equipment, a Warning notice

is used.

CAUTION

Caution notices are used where equipment malfunction is possible if care is not taken.

NOTE

APPLICATION NOTE

Notes and Application Notes call attention to information that is especially significant to

understanding and operating the equipment.

This document is based on information available at the time of its publication. While efforts have been made

to be accurate, the information contained herein does not purport to cover all details or variations, nor to

provide for every possible contingency in connection with installation, operation, or maintenance. DYMEC

assumes no obligation of notice to holders of this document with respect to changes subsequently made.

DYMEC makes no representation or warranty, expressed, implied, or statutory with respect to, and assumes

no responsibility for the accuracy, completeness, sufficiency, or usefulness of the information contained

herein. No warranties of merchantability or fitness for purpose shall apply.

Permission is granted to make a reasonable number of copies of this document for the use within an

organization that has purchased the equipment.

* Link/Repeater is used exclusively to describe DYMEC’s unique family of Fiber Optic Data Links.

This page is left blank intentionaly.

Table of Contents

Page

1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

1.1 Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

1.2 Model 5845HRT and 5846HRT Link/Repeaters . . . . . . . . . . . 1-5

1.2.1 9 Pin Data Port D-Connector . . . . . . . . . . . . . . . . 1-5

1.2.2 HD/FD Switch . . . . . . . . . . . . . . . . . . . . . . . . 1-6

1.2.3 Repeat Switch . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

1.2.4 Logic Inversion Switch . . . . . . . . . . . . . . . . . . . . 1-6

1.2.5 Input Bias Switch . . . . . . . . . . . . . . . . . . . . . . . 1-6

1.2.6 Input Data Coupling Switch . . . . . . . . . . . . . . . . . 1-7

1.2.7 Enable Holdover Switch . . . . . . . . . . . . . . . . . . . 1-7

1.2.8 Test Mode Switch . . . . . . . . . . . . . . . . . . . . . . . 1-8

1.2.9 Optical Ports . . . . . . . . . . . . . . . . . . . . . . . . . 1-8

1.2.10 Diagnostic LEDs . . . . . . . . . . . . . . . . . . . . . . . 1-9

1.2.11 Power Connections . . . . . . . . . . . . . . . . . . . . . 1-10

1.2.12 Peripheral Equipment . . . . . . . . . . . . . . . . . . . . 1-11

2. Configurations, Operation, and Installation . . . . . . . . . . . . . . . 2-1

2.1 Point-to-Point Configuration . . . . . . . . . . . . . . . . . . . . 2-1

2.2 Loop Operation - Master/Slave Configuration . . . . . . . . . . . 2-7

2.3 Loop Operation - Peer-to-Peer Configuration . . . . . . . . . . . 2-10

3. Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

3.1 Data Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

3.2 Optical Budget . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

3.2.1 Cable Attenuation Factors . . . . . . . . . . . . . . . . . . 3-1

3.2.2 Extending the Distance . . . . . . . . . . . . . . . . . . . . 3-2

3.3 Number of Repeats . . . . . . . . . . . . . . . . . . . . . . . . 3-3

3.3.1 Effects of Data Rate . . . . . . . . . . . . . . . . . . . . . 3-3

3.3.2 Pulse Width Distortion . . . . . . . . . . . . . . . . . . . . 3-3

3.3.3 Temperature Effect . . . . . . . . . . . . . . . . . . . . . . 3-4

3.4 Powering the Link/Repeater . . . . . . . . . . . . . . . . . . . . 3-4

3.4.1 Model 5845HRT & 5845SHRT. . . . . . . . . . . . . . . . . 3-4

3.4.2 Model 5846HRT & 5846SHRT. . . . . . . . . . . . . . . . . 3-4

3.5 Input Bias Switch . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5

3.5 Logic Inversion Switch . . . . . . . . . . . . . . . . . . . . . . 3-5

3.6 Echo Control for EIA 485 Master in Loop Configurations . . . . . . 3-6

3.7 Optional Station Power Voltages . . . . . . . . . . . . . . . . . . 3-6

3.8 Type of Communication . . . . . . . . . . . . . . . . . . . . . . 3-6

3.9 Selection of Fiber Optic Cable . . . . . . . . . . . . . . . . . . . 3-6

4. Testing and Trouble Shooting . . . . . . . . . . . . . . . . . . . . . . 4-1

4.1 Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

4.2 Trouble Shooting . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

5. Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

5.1 Electrical and Optical Specifications . . . . . . . . . . . . . . . . 5-1

5.2 Mechanical Dimensions of the 5845HRT & 5845SHRT . . . . . . 5-3

5.3 Mechanical Dimensions of the 5846HRT & 5846SHRT . . . . . . . 5-4

6. Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

This page is left blank intentionally.

Models 5845HRT and 5846HRT

Models 5845SHRT and 5846SHRT

EIA 422 or 485

1-1

1. INTRODUCTION

DYMEC Models 5845HRT, 5845SHRT, 5846HRT and 5846SHRT are data communication Link/Repeaters

which allow the replacement of copper wire with fiber optic cable. Link/Repeaters simply convert electrical

signals to light for transmission, then, when received, convert the light signals to electrical. This is done in

EIA 422 and EIA 485 formats.

Link/Repeaters are passive to software protocol. They are not addressable in communication protocols and

do not provide any control logic capability to support communication protocols. Link/Repeaters are designed

with several features that allow easy installation and flexibility in configuring for various communication

systems.

Models 5845HRT and 5846HRT are similar except for the voltages by which they can be powered.

Models 5845SHRT and 5846SHRT have the same features and functionality described for the Models

5845HRT and 5846HRT respectively with the exception that they have single mode optics for use with single

mode fiber cable.

NOTE

This manual makes reference to the Model 5845HRT and Model 5846HRT when describing features

and functionality of the Link/Repeaters. These descriptions generally apply to the Model 5845SHRT

and Model 5846SHRT as well. When different, a specific reference is made identifying the particular

model(s) and their variation.

The User should read this entire manual to fully understand how to use the many features of the

Link/Repeaters in an effective communication system.

1.1 DEFINITIONS

The following terms are used in this manual:

IED:

An IED is any intelligent electrical device capable of EIA 422 and/or EIA 485 data communications,

such as; a computer, RTU, PLC, "smart" meter, relay, etc. The IED must have resident software or

firmware that manages the data communication logic, including protocol (formatting and timing),

addressing capability (if required), control logic software "handshaking", and scheduling.

Point-to-Point Configuration:

Two Link/Repeaters connected directly to each other.

Master/Slave Loop Configuration:

More than two Link/Repeaters connected together where the FOC connects the T optical port of one

device to the R optical port of the next unit in the loop. One IED is designated as the Master and

controls all the communication and the other IEDs act as Slaves and respond only when specifically

polled by the Master.

Peer-to-Peer Loop Configuration:

More than two Link/Repeaters connected together where the FOC connects the T optical port of one

device to the R optical port of the next unit in the loop. Each IED has the capability of becoming loop

Master as allowed by the controlling software.

Models 5845HRT and 5846HRT

Models 5845SHRT and 5846SHRT

EIA 422 or 485

1-2

Echo:

The return of the Master's transmission back to the Master after traveling around the optical loop.

Optical Bus Configuration:

More than two Link/Repeaters connected together in a “linear” topology and there is no returning

echo of a transmission.

Optical Star Configuration:

More than two Link/Repeaters connected together in a “Hub and Spoke” topology and there is no

returning echo of a transmission.

Master:

The Master is the IED that controls the network in a Master/Slave configuration. This IED is re-

sponsible for the control of the network, the polling of the Slaves for information, and the prevention

of data collisions. In a loop configuration, the Master’s communication is echoed back to and stops

at the Master. The Master's Repeat Switch is always in the "OFF" position.

Slave:

A Slave is an IED that is passive in a Master/Slave configuration. A Slave's communication is under

the control of the Master, and only responds to specific poll requests from the Master.

Peer:

Peers are IEDs that have equal status and each may initiate a communication when allowed by the

system software by a time slot, token, etc.

FOC:

Fiber Optic Cable.

Single-mode:

Single-mode fibers generally have diameters of 5µm to 13µm. Because of this small core, only one

axial path for light propagation is available through the fiber. The optics required to drive single-

mode fiber have to be highly focused so that minimum dispersion occurs. Though requiring more

expensive optic emitters, the benefit is that longer transmission distances (<35 km) can be achieved.

Multi-mode:

Multi-mode fibers have core diameters of 50µm and larger. This larger core allows the light rays to

be propagated along several different paths down the fiber. The different paths include an axial

component as well as reflected components. Multi-mode units are economical and effective for

transmission over distances up to 6 km.

Repeat Switch:

The Repeat Switch enables (REP) or disables (OFF) the repeater function of the Link/Repeater.

HD / FD Switch:

This switch adapts the Link/Repeater to accept independent transmit and receive channels (4 wire

normally associated with EIA 422) or a shared transmit/receive channel (2 wire, generally EIA 485).

Data Coupling Switch:

This Switch adapt the Link/Repeater for either DC or AC electrical input data coupling. With AC

data coupling, the minimum input data rate is 1600 baud. With DC data coupling there is no

minimum input data rate, but a signal stuck high on the input will lock up a loop, bussed or star

network.

Models 5845HRT and 5846HRT

Models 5845SHRT and 5846SHRT

EIA 422 or 485

1-3

Test Mode Switch:

Models 5845 and 5846 are provided with this switch to allow users who wish to test the fiber

connections of the link with a built in diagnostic mode. This mode sends a 1KHz signal out the

transmit port as well as looping back the copper port (pins 1 to 3 and 2 to 4) for diagnostic

purposes. For the electrical connection this only works in Full Duplex Mode.

Enable Holdover Switch 0 and 1:

Models 5845 and 5846 provide two switch positions for the user to select one of four enable holdover

times: 4uS (8 bit times at 2MBPS, the same as the previous generation 5845/46 links), 71uS (8 bit

times at 112kBPS), 833uS (8 bit times at 9.6kBPS), and 8mS (8 bit times at 1kBPS) for the user.

The factory default setting is 4uS.

Biasing Resistor Switch:

This switch allows the Link/Repeater to easily add or remove the device input bias resistors to

reduce the loading on a copper bus network. The Bias resistors are 330 Ohms.

Simplex Communication:

Transmit only or receive only communications.

Half Duplex Communication:

Sequential transmit and receive communications.

Full Duplex Communication:

Simultaneous transmit and receive communications.

Transmit optical port.

TE:

Diagnostic LED that illuminates when the Link/Repeater is receiving an electrical transmit from its

IED.

TO:

Diagnostic LED that illuminates when the Link/Repeater is transmitting a signal optically.

Receive optical port.

RE:

Diagnostic LED that illuminates when the Link/Repeater is delivering a received optical signal

electrically to the IED.

RO:

Diagnostic LED that illuminates when the Link/Repeater is receiving a signal optically.

Optical Budget:

The optical budget is expressed in dB and is the amount of light loss tolerated for communication.

The total distance between two devices that a signal can be transmitted is determined by subtracting

all the losses of the optical circuit from the optical budget. Various factors in the optical circuit

attenuate the light transmission and must be accounted for to assure a reliable optical circuit. Key

factors include cable attenuation (expressed as dB per unit length), cable aging, and cable fittings

(terminations, splices, splitters, etc.).

Models 5845HRT and 5846HRT

Models 5845SHRT and 5846SHRT

EIA 422 or 485

1-4

Non-Return to Zero (NRZ):

This type of encoding scheme does not require the voltage potential of each data bit to return to the

zero potential. No clock or timing recovery is provided with this type of communication except in the

start and stop bits usually found on each data word.

Return to Zero (RZ):

This type of encoding scheme requires the voltage potential of each data bit to return to the zero

potential. This allows timing recovery with each bit instead of just the start and stop bits of the data

word.

Number of Repeats:

The Number of Repeats is the number of Link/Repeaters that may be connected in a network when

the Repeat function is required such as in loop configurations. The sum of Slaves in a Master/Slave

loop is the number of repeats for that type of loop. The number of Peers minus one is the number of

repeats in a Peer-to-Peer loop.

Asynchronous Communication:

This type of communication does not transmit a separate clock signal with the data signal.

Link/Repeaters support asynchronous communication. A communication scheme where the clock

needs to be transmitted (Synchronous Communication) is not supported unless the clock is

embedded with the data.

Models 5845HRT and 5846HRT

Models 5845SHRT and 5846SHRT

EIA 422 or 485

1-5

1.2 MODEL 5845HRT AND MODEL 5846HRT LINK/REPEATERS

NOTE

Link/Repeaters contain no serviceable parts. Opening the unit will void the warranty.

Each Link/Repeater consists of the following elements shown in Figure 1.

DYMEC MODEL 5945 LINK/REPEATER

RS-422/485

SWITCH ACCESS

MADE IN U.S.A.

PWR

#6-32 Thread SST

Earth Ground

Diagnostic LED's

12 Vdc Power Input

Type "ST"

Fiber Connector

9 Pin D Sub

Connector

Removeable

Access Plate

FIGURE 1. Elements of the Link/Repeater (5845HRT or 5845SHRT)

1.2.1 9 Pin Data Port D-connector

The Link/Repeater connects to an IED's EIA 422 or 485 communication port. The pin out

configuration of the Link/Repeater is shown in Figure 2. If the IED's port is not a 9 Pin D-connector

or if the IED's pin out configuration differs, an adapter is required.

FIGURE 2. Data Port Pin Assignments

HD Mode

FD Mode

• 1 Trans/Rec Data −

−−

− [B/B’](I/O) • 1 Transmitted Data −

−−

− [B] (Link Input)

• 2 Trans/Rec Data + [A/A’] (I/O) • 2 Transmitted Data + [A] (Link Input)

• 3 No Connect • 3 Received Data −

−−

− [B’] (Link Output)

• 4 No Connect • 4 Received Data + [A’] (Link Output)

• 5 Signal Ground • 5 Signal Ground

• 6 Earth Ground • 6 Earth Ground

• 7 Repeat Enable/Disable • 7 Repeat Enable/Disable

• 8 Optical Enable/Disable • 8 Optical Enable/Disable

• 9 +9-15 Vdc Power (Pin 5 GND) • 9 +9-15 Vdc Power (Pin 5 GND)

Models 5845HRT and 5846HRT

Models 5845SHRT and 5846SHRT

EIA 422 or 485

1-6

1.2.2 HD/FD Switch

The HD/FD Switch adapts the Link/Repeater to accept independent transmit and receive channels or

a single shared transmit/receive channel.

HD: In this position, the Link/Repeater accepts a shared transmit/receive communication channel

such as normally associated with EIA 485 2 wire standards. When in the HD position, the

Link/Repeater is "listening" for data signals both optically and electrically and automatically

switches to the correct state. This position is normally used for EIA 485 2 wire connections

and only half-duplex or simplex communication is available. Multi-drop networks may be

either Peer-to- Peer or Master / Slave.

FD: When independent transmit and receive electrical channels are available, select the FD

position. This will normally be used for EIA 422 or EIA 485 4 wire standards. The

Link/Repeater can support full duplex, half duplex or simplex communication in this position.

Multi-drop networks may only be Master / Slave.

1.2.3 Repeat Switch

The Repeat switch enables the repeater function in the "ON" position and disables it in the "OFF"

position.

REP: The repeater function available in the Link/Repeater is enabled. This function converts the

optical signal received on the R optical port to an electrical signal and delivers this signal to

the appropriate pins of the 9 Pin connector, as well as, re-transmits the signal optically out

the Link/Repeater's T optical port.

OFF: The repeater function available in the Link/Repeater is disabled. The Link/Repeater converts

the optical signal received on the R optical port to an electrical signal and delivers this signal

to the appropriate pin of the 9 Pin connector, and does not re-transmit the signal optically out

the Link/Repeater's T optical port.

1.2.4 Logic Inversion Switch

Use of this feature is required when optically interconnecting IEDs using RS-232 to IEDs using EIA

422 or 485 or IEDs that have biasing that pulls the “A” (+) line high and the “B” (-) line low during the

quiescent state. (Refer to Section 3.5)

1.2.5 Input Bias Switch

The Biasing resistor switch selects electrical input biasing. Biasing on RS422/485 inputs provides

the ability for the inputs to a device (the Link/Repeater) to be in a known electrical state if the

outputs that are connected to it go into a Tri-State (non driving) condition. Pins marked B or - are

pulled to +5 volts and pins marked A or + are pulled to Signal Ground. The default for the biasing

resistors is 330 Ohms, optionally no biasing can be selected.

Bias: 330 Ohm Biasing resistors. This is equivalent to 9 loads when configuring a bus

network configuration.

Out: No biasing resistors. This is the equivalent to 1 load when configuring a bus network.

This setting should be used on at least one Link/Repeater if there are 2 or more

electrically connected IED’s in a copper bus network segment.

Models 5845HRT and 5846HRT

Models 5845SHRT and 5846SHRT

EIA 422 or 485

1-7

1.2.6 Input Data Coupling Switch

The Data Coupling switch selects the electrical input conditioning, the AC position selects

capacitively coupled, the DC position is directly coupled.

AC: AC coupling has a minimum incoming data requirement of 1600 baud due to the

capacitive coupling. This option blocks DC electrical levels should the device

connected fail and ‘stick in a high level’. There is a 35 mS timeout for “stuck” output

pins, after this time out the link returns to LED off state.

DC: DC coupling allows DC logic levels to be transmitted over the fiber network, care

must be taken to guarantee that when any device stops transmitting packets that the

input level returns to a state that allows the T receptacle (emitter) to turn off. If it does

not and the IED is part of a loop, bussed or star network, the first device to transmit

blocks all other devices on the network from transmitting. *Single-Mode units cannot

be DC coupled.

1.2.8 Enable Holdover Switch

Since the 5845/46 Link/Repeaters are protocol and baud rate independent, we have no way of

determining the end of a word or packet, and therefore, when to tri-state the EIA-422/485

driver. To overcome this obstacle, we drive ‘1’ data bits for the full length of the bit and we drive

‘0’ data bits for a pre-determined time. After that, the bias resistors hold the line in the ‘0’ state.

In most installations, the bias resistor circuit provides enough current for reliable

communications, but in some cases (e.g. when our Link is electrically connected to many

receivers) data errors can occur. We provide two dipswitch positions for the user to select one

of four enable holdover times: 4uS (8 bit times at 2MBPS, the same as the previous generation

5845/46 links), 71uS (8 bit times at 112kBPS), 833uS (8 bit times at 9.6kBPS), and 8mS (8 bit

times at 1kBPS) for the user to rectify this situation (See Figure 3). Extending the enable

holdover time can improve the reliability of communications, but care must be taken to ensure

that the enable holdover time does not exceed the minimum interpacket gap in that particular

installation The factory default setting is 4uS.

HLD OVR 0

8HLD OVR 1

HLD OVR 0

8HLD OVR 1

HLD OVR 0

8HLD OVR 1

HLD OVR 0

8HLD OVR 1

4µs 71µs 833µs 8ms

Figure 3 Enable Holdover Switch Settings

Models 5845HRT and 5846HRT

Models 5845SHRT and 5846SHRT

EIA 422 or 485

1-8

1.2.9 Test Mode Option Switch

Models 5845 and 5846 Links/Repeater are provided with this switch to allow users who wish

to test the fiber connections of the link with a built in diagnostic mode. This mode sends a

1KHz signal out the transmit port as well as looping back the copper port (pins 2 to 4 and pins

1 to 3) for diagnostic purposes. The loop back option for the copper/electrical port of the

Link/Repeater is only available for Full Duplex mode.

1.2.10 Optical Ports

There are two optical ports, T and R. The T optical port transmits data signals optically to the

next Link/Repeater. The R port receives the optical data signal from another Link/Repeater's

T optical port. Each port is fitted with an "ST" type receptacle for connecting the FOC. (See

Figure 4).

Fiber Connector

9 Pin D Sub

Connector

Pin 1

FIGURE 4. Optical Ports and 9 Pin Data Connection

Models 5845HRT and 5846HRT

Models 5845SHRT and 5846SHRT

EIA 422 or 485

1-9

Test Mode ON/OFF

Data Coupling DC/AC

Repeat Mode ON/OFF

HLD OVR 0

Bias / Out

9 7 6810 4 2 135

Bias / Out

HLD OVR 1

Invert / Norm

HD / FD

FIGURE 5. Switch Settings (Factory Defaults)

Normal Repeat

PWR

Normal Receive

PWR

Normal Transmission

PWR

FIGURE 6. Diagnostic LED’s and Data Signal Path

1.2.11 Diagnostic LEDs

Each Link/Repeater is equipped with four green diagnostic LEDs. They represent the electrical

transmit (TE), optical transmit (TO), electrical delivery (RE), and optical receive (RO) paths. These

LEDs, when illuminated, show that the appropriate path is active. When the Link/Repeater is

transmitting, both TE and TO LEDs will illuminate to show the transmit path active. When the

Link/Repeater is receiving light signals, both RO and RE LEDs will illuminate. If the unit is in the

repeat mode and receiving light, the RO, RE and TO LEDs will illuminate because the signal is being

re-transmitted out the optical port, as well as, being delivered to the D-connector. LEDs only

Models 5845HRT and 5846HRT

Models 5845SHRT and 5846SHRT

EIA 422 or 485

1-10

illuminate when the path is active; powering of the unit does not illuminate these LEDs unless their

path is active. When data is present on the paths, the LEDs may "flicker"; this is normal. The

diagnostic LEDs may be used for trouble shooting by observing that the illumination of the LEDs

corresponds with activity in the unit. See Figure 6 for LED patterns and signal paths.

NOTE

The diagnostic LEDs only illuminate when there is signal traffic and are not illuminated during signal

"quiet" times. If during quiet time, TE and TO are illuminated, it suggests either a polarity reversal (pins 1 &

2) or that the IED is biased pulling the “A” (+) line with respect to the “B” (-) line. After checking the

polarity on the connections, refer to Section 3.5.

The diagnostic LEDs may "flicker" when data is passing. This is normal operation.

1.2.12 Power Connections

1.2.12.1 Powering Model 5845HRT and 5845SHRT

Model 5845HRT may be powered either through pin 9 of the 9 Pin D-connector or the

power connector on the side of the unit:

1) When powering the 5845HRT via pin 9 (pin 9 + with pin 5 as GND) of its D-

connector, the IED must supply at least 250 mA (340mA for the 5845SHRT). The

voltage should be noise free and regulated within a range of 9 to 15 Vdc.

2) When powering the 5845HRT via its power connector the device requires

regulated voltage within a range of 9 to15 Vdc. DYMEC offers a 110 Vac to 12 Vdc

adapter, Model 4310S (Model 4320S for 220 Vac 50 Hz) that is designed

specifically for 5845HRT & 5845SHRT. Model 4310S assures reliable power over

the temperature range of 0°C to + 70°C.

CAUTION

Regardless of the power connection used, Model 5845HRT

requires 250 mA within a range of 9 to 15 VDC. The 5845SHRT

requires 340 mA. An inadequate power supply not capable of

supplying this current over the entire operating temperature range

may cause the device to malfunction.

1.2.12.2 Powering the Model 5846HRT and 5846SHRT

Model 5846HRT and the 5846SHRT may be powered either through pin 9 of the 9 Pin

D-connector or the power connector located on the side of the unit:

1) When powering Model 5846HRT via pin 9 (Pin 9 + with pin 5 as GND) of its D-

connector, the IED must supply at least 250 mA (340mA for the 5846SHRT). The

voltage should be regulated and within a range of 9 to 15 Vdc.

2) Model 5846HRT has an internal regulated switching power supply that may be

connected directly to ac or dc station power. The station power may be 90 to 250

Vac, 50/60 Hz or 90 to 250 Vdc. The station voltage may be unregulated, but the

circuit must be capable of providing a minimum of 45mA (60 mA for the Model

5846SHRT) continuously. Model 5846HRT has a ground stud (#6-32 bolt) and a

power connector on the side of the case. If a Model 5846HRT is powered through

Models 5845HRT and 5846HRT

Models 5845SHRT and 5846SHRT

EIA 422 or 485

1-11

the power connector, then connect a suitable earth ground to the grounding stud

on the side of the Link/Repeater. Loosen the captive screws and remove the

power plug from the power connector of the Link/Repeater. Connect the power

lines to the power plug being careful not to leave any wire strands exposed.

NOTE

Model 5846HRT can be ordered to accommodate 24 - 48 Vdc (requires 250 mA)

This power input to the Model 5846HRT-L is Surge Withstand Protected to IEEE 1613 for all input voltages.

WARNING

When installing a Model 5846HRT or 5846SHRT Link/Repeater,

an earth Ground must be attached to the Ground Stud on the side

of the case before connecting to power. Failure to follow this

procedure may result in electrical shock to personnel.

1.2.13 Peripheral Equipment

1.2.13.1 IED

An IED is any intelligent electrical device such as; a computer, RTU, PLC, "smart" meter,

relay, etc., that has the ability to communicate data via EIA 422 or EIA 485 format. The

IED should have a communication port for the connection of the Link/Repeater. If the

IED's communication port connector does not accept the Link/Repeater to be plugged in

directly, an adapter must be made to accommodate the connection. Care should be

taken to assure that the correct signals are connected to each other. See Figure 2 for

the Link/Repeater's pin signal assignments. Check your IED's equipment manual for its

signal assignments.

The IED must also have intelligent software to execute the data communication. This

intelligence needs to logically manage the data and signal traffic, including any

addressing, token passing, "handshaking", data formatting and scheduling.

1.2.13.2 Fiber Optic Cable (FOC)

The selection of the fiber optic cable is important. High quality cable can assure the

maximum performance of your Link/Repeater. Important factors to consider are the

manufacturer's specification on attenuation per unit length, attenuation due to aging,

diameter, and tensile strength. Choosing the best quality FOC for your installation is

important.

NOTE

DYMEC can supply multi-mode glass FOC in Simplex, Duplex, or Breakout construction, cut to

length, terminated, polished and tested. The specifications for all DYMEC supplied cables are

as follows:

Fiber Diameter: 62.5/125µm

Tensile Strength: 100 kpsi

Loss: 3 dB per kilometer

Aging Loss: less than 3 dB

Models 5845HRT and 5846HRT

Models 5845SHRT and 5846SHRT

EIA 422 or 485

1-12

Model 5845HRT and Model 5846HRT Link/Repeater optical ports are designed for ST

type terminations and are compatible with multi-mode FOC ranging from 50 µm to 200

µm.

Model 5845SHRT and Model 5846SHRT Link/Repeater optical ports are designed for

ST type terminations and are compatible with single-mode FOC ranging from 5 µm to 13

µm.

Models 5845HRT and 5846HRT

Models 5845SHRT and 5846SHRT

EIA 422 or 485

2-1

2. CONFIGURATIONS, OPERATION, AND INSTALLATION

Model 5845HRT and Model 5846HRT Link/Repeaters can be connected in; a Point-to-Point configuration, an

Optical Bus network, an Optical Star network, a Master/Slave Loop, or a Peer-to-Peer Loop configuration

depending on the needs of the overall communication system.

Model 5845HRT and Model 5846HRT are designed to accept differential electrical inputs per EIA 422 and EIA

485 standards. Various implementations of these electrical standards can result in different types of electrical

circuits. The EIA 422 standard and the EIA 485 4 wire standard are normally associated with independent and

separate transmit and receive channels. In Multi-drop networks, these standards allow Master / Slave operation

only.

The EIA 485 2 wire standard generally uses a bi-directional, shared transmit/receive channel. In multi-drop

networks, either Peer-to-Peer or Master / Slave operation is possible. The HD/FD switch on each Model

5845HRT and Model 5846HRT configures the Link/Repeater to accept either condition.

When the HD/FD switch is in the HD position, the Link/Repeater operates in half duplex mode only and both

transmit and receive signals share pins 2 (A) and 1 (B).

In the FD position, Link/Repeater pins 2 (A) and 1 (B) connect to the IED's transmit channel. Link/Repeater pins

4 (A') and 3 (B') connect to the IED's receive channel.

NOTE

Some IEDs use "+" and "-" labels for their signals. A and A' are "+" and B and B' are "-".

It is possible to optically connect Link/Repeaters together which are connected to IEDs with different electrical

formats, i.e. EIA 422, EIA 485 4 wire and EIA 485 2 wire. It is also possible to optically interconnect Models

5845HRT and 5846HRT to DYMEC Models 5843HRT and 5844HRT which are connected to IEDs operating RS

232 or TTL formats. See section 3.5.

APPLICATION NOTE

DYMEC Models 5843HRT, 5844HRT, 5845HRT and 5846HRT can optically communicate to each

other, eliminating the need for format translation interfaces, provided all connected devices are

operating at the same data rate and using the same protocol. (Refer to Section 3.5).

2.1 POINT-TO-POINT CONFIGURATION

For Point-to-Point operation, two Link/Repeaters are optically connected to each other. The HD/FD switch is set

to the position that satisfies the IED that is connected to the Link/Repeater.

This configuration permits half duplex communication (sequential transmitting and receiving) and simplex

(transmitting or receiving only) when the HD/FD switch is in either position. Full duplex is only available for

circuits with independent transmit and receive channels where the HD/FD switch is placed in the FD position.

APPLICATION NOTE

In Point-to-Point operation, the communication logic (control software) of the IEDs must manage:

1) The transmission of data signals.

2) The receipt of data signals.

3) Any "handshaking" required must be accomplished through software.

Models 5845HRT and 5846HRT

Models 5845SHRT and 5846SHRT

EIA 422 or 485

2-2

2413 2413

OFF

Repeat

Switch

IED

T+ T- R+ R-

IED

T+ T- R+ R-

OFF

Repeat

Switch

FIGURE 7. Point-to-Point Configuration

2.1.1 Installation

1. Set the HD/FD Switch to the appropriate position for each Link/Repeater and its respective IED.

2. Set the Repeat Switch on all of the units to the "OFF" position.

3. Connect the Link/Repeater to the IED's EIA 422 or 485 communication port (including any adapter that

may be needed).

4. Connect the Fiber Optic Cables (T of one device to R of the second device).

5. Connect power to the Link/Repeater as follows:

A) If the unit is to be powered through the D-connector (+ 9 to + 15 VDC on pin 9 with pin 5 used as

GND), then the unit is energized when it is connected to the D-connector and the green “POWER”

LED illuminates.

B) If the unit is to be powered through power connector, connect the appropriate power source and

energize the power source. The unit is now powered and the green “POWER” LED illuminates.

WARNING

When installing a Model 5846HRT or 5846SHRT Link/Repeater, an earth

Ground must be attached to the Ground Stud on the side of the case

before connecting to power. Failure to follow this procedure may result in

electrical shock to personnel.

6. The units are now installed and operating.

7. Verify operation using the diagnostic LEDs. (See Figure 5).

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Belden Magnum RS485 Fiber Optic Link Installation & User Guide

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Model: Magnum RS485 Fiber Optic Link

Type: Installation & User Guide

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Belden Magnum RS485 Fiber Optic Link Installation & User Guide

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